[QGIS-Developer] Suggestion for improved macOS build compatibility testing

[Tom Elwertowski]

Hi all,

Both yesterday and today, the macOS build failed due to missing CMake 
INCLUDE specifications.

MacOS puts each framework in a separate directory while Linux merges 
everything into /usr/local. Thus, Linux commits will compile when a new 
dependency is added as long as some other dependency already specifies 
/usr/local.

Here is an idea that would help macOS build compatibility. Place each 
dependency on the verification build machine in a separate directory such as
/usr/local/gdal-2.2.3/
/usr/local/geos-3.6.1/

This would make commits fail upfront on Linux if CMake INCLUDES needed 
by macOS were missing.

Tom